how to disable proximity sensor incall (for novices)

[Droid 007 0]

I bought T-Mobile Vivacity White phone recently, unlocked and put Fish n Chips 7 ROM in it and then gave it as a gift to my friend abroad (who is not technically literate). Now she is saying that when in call, the screen goes blank and does not come back. After goggling it seems it is due to proximity sensor.

My question is - what is the easiest way to disable "proximity sensor" "incall"? Is there an app that could be used?

[CurtisAndroidSF2 32]

It's probably just a calibration issue. I'm positive there's an option in the FNC options to calibrate the proximity sensor. Just tell her to look through the settings on her phone, probably under 'Advanced' or 'Display'.

Failing that, there's probably a proximity calibration app in the Play Store.

[app10336 3]

On FNC, «call» *983*0# and search for sensor menu press «calib» button.